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In the early 1900s it was said that in some areas of the High Sierra Mountains the Mountain Yellow-Legged Frogs were so thick you could walk across lakes on them.
Since that time over 90% of their known population has disappeared. Their plummeting numbers are believed to have been caused by the introduction of non-native trout.
The trout feed on the tadpoles and juvenile frogs.
Range: Sierra Nevada mountains in California and Nevada and the San Gabriel San Bernardino and San Jacinto Mountains in southern California.
Species: Rana muscosa
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